Air Quality Model Regional Ozone Street Canyon Indicator Data Scenario Comparaison

Regional Ozone - Genoa


Initial reference scenario

The initial reference scenario results are copied here from D5.1, and are included in the current addendum in order to provide a complete picture of the work done for the reference scenario.

 

Figure A.2. Number of days with 8hour running average ozone concentration exceeding 120ìg/m3 (IND120), calculated by the OFIS model, for a 150x150km2 area surrounding Genoa, and wind rose of prevailing wind during the summer semester of 1999 (draft reference scenario).

 

Figure A.2 shows the initial estimation for the number of days exceeding 120ìg/m3 – as daily 8hour average – for the six months period studied and the wind rose[1] corresponding to this period. Instead of occurring in the urban ozone plume as expected, exceedances are observed away from the city and the area influenced by it; this unrealistic pattern is the consequence of air masses extremely rich in ozone and other pollutants entering in the area from the domain’s boundaries. These boundary concentration values of main photochemical pollutants were supplied by the partners and although they should correspond to background levels, they were high enough to be observed in extremely polluted urban plumes. Lower ozone concentrations – and consequently fewer exceedances – are calculated in the urban area, as NO emissions consume ozone, and downwind, as “cleaner” air is advected from the city. Based on the above findings, a revised set of data was provided by the Genoa partners, resulting in the exceedances presented in Figure A.3.

 

Figure A.3. Number of days with 8hour running average ozone concentration exceeding 120ìg/m3 (IND120), calculated by the OFIS model, for a 150x150km2 area surrounding Genoa and wind rose of prevailing wind during the summer semester of 1999 (final initial reference scenario).

 

Figure A.3.shows the final estimation for the number of days exceeding 120ìg/m3 – as daily 8hour average – for the six months period studied and the wind rose[2] corresponding to this period. Exceedances are observed in combination with the urban ozone plume, and the pattern is now more realistic, due to the refined boundary condition data. Lower ozone concentrations – and consequently fewer exceedances – are calculated in the urban area, as NO emissions consume ozone, and downwind, as “cleaner” air is advected from the city. As a final check, comparisons were made between the results presented here and the results that were made available from the GEA report (de Leeuw et. al., 2001). Thus, it should be noted that the exceedances calculated in the GEA report for Genoa were higher than the ones of the SUTRA reference scenario, the same standing for the emission data, thus verifying the importance of the emission related ozone production mechanisms in the area.

 

The indicators resulting for the Initial reference scenario are as follows:

 

 

AOT(max),

AOT(ave),

AOT(sub),

AOT(town)

AOT60

144.11

19.12

3.81

1.79

 

IND120(domain)

IND120(sub)

IND120(town)

 

DAYS

61

28

12

 

 


Final reference scenario

 

In continuation of the previous work, the Genoa city partners provided with updated input data for the final reference scenario. Calculation results are presented below.

 

Figure A.4. Number of days with 8hour running average ozone concentration exceeding 120ìg/m3 (IND120), calculated by the OFIS model, for a 150x150km2 area surrounding Genoa and wind rose of prevailing wind during the summer semester of 1999 (final reference scenario).

 

The indicators resulting for this scenario are as follows:

 

 

AOT(max),

AOT(ave),

AOT(sub),

AOT(town)

AOT60

144.26

19.13

4.11

2.18

 

IND120(domain)

IND120(sub)

IND120(town)

 

DAYS

61

31

16

 

 

«New Statistics»for Ozone

ST

ave_ofis

aot_ofis

ind_ofis

1

42.41

9.69

70

2

35.84

8.07

59

3

43.13

10.39

67

4

33.14

5.8

46

5

11.46

0.57

9

6

33.54

5.87

46

7

43.18

10.5

67

8

36.11

8.07

59

9

41.96

8.82

65


Scenario S1

 

Figure A.5. Number of days with 8hour running average ozone concentration exceeding 120ìg/m3 (IND120) calculated by the OFIS model, for a 150x150km2 area surrounding Genoa and wind rose of prevailing wind during the summer semester of 1999.

The indicators resulting for this scenario are as follows:

 

 

AOT(max),

AOT(ave),

AOT(sub),

AOT(town)

AOT60

144.02

19.12

4.17

2.26

 

IND120(domain)

IND120(sub)

IND120(town)

 

DAYS

61

31

17

 

 

«New Statistics»for Ozone

ST

ave_ofis

aot_ofis

ind_ofis

1

42.51

9.69

70

2

35.88

8.07

59

3

43.17

10.39

67

4

33.17

5.84

46

5

12.07

0.71

11

6

33.55

5.89

46

7

43.21

10.5

67

8

36.15

8.07

59

9

42.2

8.93

66


Scenario S2

 

Figure A.6. Number of days with 8hour running average ozone concentration exceeding 120ìg/m3 (IND120) calculated by the OFIS model, for a 150x150km2 area surrounding Genoa and wind rose of prevailing wind during the summer semester of 1999.

The indicators resulting for this scenario are as follows:

 

 

AOT(max),

AOT(ave),

AOT(sub),

AOT(town)

AOT60

143.98

19.13

4.19

2.28

 

IND120(domain)

IND120(sub)

IND120(town)

 

DAYS

61

31

17

 

 

«New Statistics»for Ozone

ST

ave_ofis

aot_ofis

ind_ofis

1

42.51

9.78

70

2

35.88

8.07

59

3

43.16

10.39

67

4

33.17

5.85

46

5

11.92

0.71

10

6

33.56

5.94

46

7

43.21

10.5

67

8

36.14

8.07

59

9

42.14

8.92

65


Scenario S3

 

Figure A.7. Number of days with 8hour running average ozone concentration exceeding 120ìg/m3 (IND120), calculated by the OFIS model, for a 150x150km2 area surrounding Genoa and wind rose of prevailing wind during the summer semester of 1999.

The indicators resulting for this scenario are as follows:

 

 

AOT(max),

AOT(ave),

AOT(sub),

AOT(town)

AOT60

144.05

19.11

4.14

2.23

 

IND120(domain)

IND120(sub)

IND120(town)

 

DAYS

61

31

17

 

 

«New Statistics»for Ozone

ST

ave_ofis

aot_ofis

ind_ofis

1

42.48

9.61

69

2

35.87

8.07

59

3

43.17

10.39

67

4

33.17

5.82

46

5

12.07

0.68

11

6

33.54

5.85

46

7

43.21

10.5

67

8

36.14

8.07

59

9

42.2

8.91

66


Scenario S4<

 

Figure A.8. Number of days with 8hour running average ozone concentration exceeding 120ìg/m3 (IND120), calculated by the OFIS model, for a 150x150km2 area surrounding Genoa and wind rose of prevailing wind during the summer semester of 1999.

The indicators resulting for this scenario are as follows:

 

 

AOT(max),

AOT(ave),

AOT(sub),

AOT(town)

AOT60

143.99

19.12

4.17

2.27

 

IND120(domain)

IND120(sub)

IND120(town)

 

DAYS

61

31

17

 

 

«New Statistics»for Ozone

ST

ave_ofis

aot_ofis

ind_ofis

1

42.51

9.7

70

2

35.88

8.07

59

3

43.17

10.39

67

4

33.17

5.84

46

5

12.05

0.71

11

6

33.55

5.9

46

7

43.21

10.5

67

8

36.14

8.07

59

9

42.19

8.93

66

Scenario summary

 

The next figure provides with an overall summary of the indicators vs scenarios for Genoa, indicating that the scenario performance is identical, with the slight exception of IND120.

 

Figure A.9. Overall summary of the indicators vs scenarios for Genoa.

 


The same conclusion is supported by the next three diagrams (Figure A.10) concerning the “new statistics” introduced. A slight difference at the city centre is attributed to the urban NO emissions influencing the Ozone concentrations.

 

 

 

Figure A.10. Receptors (x axis) and indicator values (y axis) for the Genoa scenarios.


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